Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!ncar!ames!elroy!gryphon!vector!telecom-request From: elroy!suned1!efb@ames.arc.nasa.gov (Everett F. Batey II) Newsgroups: comp.dcom.telecom Subject: Re: image compressing in facsimile machines - algorithm wanted Message-ID: Date: 28 Aug 88 07:25:34 GMT Sender: chip@vector.UUCP Reply-To: elroy!suned1!efb@ames.arc.nasa.gov (Everett F. Batey II) Lines: 20 Approved: telecom-request@vector.uucp (USENET Telecom Moderator) X-TELECOM-Digest: volume 8, issue 136, message 7 X-Submissions-To: telecom@xx.lcs.mit.edu (Mailing List Coordinator) X-Administrivia-To: telecom-request@vector.uucp (USENET Telecom Moderator) In article robert@eva.slu.se (Robert Olsson datoravd, EMC tfn 018-172581) writes: >X-Administrivia-To: telecom-request@vector.uucp (USENET Telecom Moderator) > >Has anybody made an implementation of the codes in the CCITT T.4 telefax There are many ( software and hardware ). Unicon ( suned1!unicon!psc@elroy.JPL .NASA.Gov did ours. I STRONGLY urge you invest in the CCITT Red Book, in english from some outfit in Vienna, VA, USA. Or find your government rep to the CCITT for local availability. There are many qualities of implementations of Gp IV, 6X to 40X or better of compression and seconds to minutes to do the lookups. It appears the standard may be partly implemented ( like Gp III ) or VERY FULLY, MUCH better but slower. This is a LOT of work to implement. -- suned1!efb@elroy.JPL.Nasa.Gov sun!tsunami!suned1!efb efbatey@NSWSES.ARPA Any statements / opinions made here are mine, alone, not those of the United States, the DoD, the Navy, the Congress, the Judiciary, nor ...